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Etude des corrélations structure-propriétés tinctoriales des fibres d'acide polylactique (PLA)

Abstract : The fibers of poly (lactic acid) (PLA), derived from annually renewable agricultural resources, had a great potential when they were first introduced into the market as they have the advantages of synthetic fibers, as well as they are biodegradable. Some current challenges and limitations associated with these new fibers have constrained their popularity, especially when they were dyed. They easily become saturated leading to pastel shades and their washfastness is poor. We verified that the crystallinity of PLA fibers is comparable to that of conventional polyester (55 - 60% at worst). However, this crystallinity has increased during the wet treatment, especially dyeing, which may be due to the hydrolysis of amorphous regions. Rapid stricke of the dye means that the amorphous regions are barely oriented (hence X-ray background intensity is really flat) and they do not retain the dye molecules.The adsorption isotherms also show that there is no adsorption but it is a "solution" as they are of the Nernst type and the dye fixation decreases with increasing temperature. But each wet treatment leads to a fiber hydrolysis which causes a loss of dye and a slow loss of mechanical properties of the fiber. The latter phenomenon is relatively long leading to a hypothesis that the hydrolysis by side-group elimination would be faster than the degradation of weak points in the macromolecular polymer chains.
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Mohammad-Bassem Bilal. Etude des corrélations structure-propriétés tinctoriales des fibres d'acide polylactique (PLA). Autre. Université de Haute Alsace - Mulhouse, 2010. Français. ⟨NNT : 2010MULH3528⟩. ⟨tel-00712551⟩

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